6i6 



SCIENCE. 



vomiting and remained unmolested during the rest of the 

 journey. This fact appeared remarkable to me. The bene- 

 fit had been immediate." If this observation can be con- 

 firmed by other similar cases, it would be very fortunate, 

 for then the surgeons of the maritime and transatlantic com- 

 panies would be able to relieve passengers who suffer sea- 

 sickness. 



The Separation of Wool and Silk in Woven 

 Goods. — A. Remont. — The following method is suffi- 

 ciently exact for commercial purposes : the sample is kept 

 for a quarter of an hour in boiling water containing 5 per 

 cent, of hydrochloric acid, and is then washed and dried. 

 The threads of the warp are then separated, if possible, 

 from those of the weft, and examined separately as fol- 

 lows : a thread is burnt. There is given off a smell like 

 burning horn, and a thread heated with a fragment of caus- 

 tic soda evolves ammonia. In this case some threads are 

 plunged in basic zinc chloride at a boil. If they dissolve 

 completely the threads are silk. If on adding hydrochloric 

 acid there is a plentiful flocculent precipitation, the threads 

 are silk mixed with wool or with vegetal fibres. If nothing 

 dissolves in zinc chloride, the threads are plunged in a boil- 

 ing solution of soda, not too concentrated. If they dis- 

 solve completely, ivool. If partially, ww/and cotton. If no 

 odor of burnt horn is given off, ths threads consist entirely 

 of vegetal fibres. These results may be confirmed by 

 means of the microscope. For the quantative examina- 

 tion, if the preliminary tests show silk, wool, and cotton, 

 four swatches weighing each 4 grms. are cut; one is laid 

 aside and the three others are boiled. — Journal de Phar- 

 macie et de Chimie. 



The Reduction of Copper Solution by Glucose* ap- 

 pears first to have been utilized by Trommer. Frommherz 

 suggested tne employment of a citrate to keep the cupric 

 oxide in solution. Modifications of the ordinary alkaline 

 tartrate solution have been devised by Barreswil, Poggiale, 

 Rosenthal, Chevalier, Boussingault, Reveil, Fehling 

 Strohl, Viollette, Magneshahens, Lowenthal, Joulie, Pos 

 soz, etc. Loewe employed glycerin instead of a tartrate. 

 Various treatments of the precipitated cuprous oxide have 

 been proposed by the following chemists : Mohr dissolves 

 the oxide in hydrochloric acid, and titrates with perman- 

 ganate. Brunner dissolves in an acid solution of ferric 

 chloride, and estimates the reduced iron by bichromate or 

 permanganate- Champion and Pellet dissolve the precipi- 

 tate in hydrochloric acid and chlorate of potassium, boil 

 off free chlorine, and titrate the liquid with stannous chlo- 

 ride. Girard and Sjxhlet reduce the cuprous oxide in hy- 

 drogen, and weigh the metallic copper. Muter dries the 

 cuprous oxide at 100 C, and weighs it as Cu 2 0. O'Sulli- 

 van and other operators ignite the precipitate strongly, and 

 weigh as CuO. Ferdinand-Jean dissolves the cuprous 

 oxide in hydrochloric acid, and weighs the metallic silver 

 precipitated on adding arnmoniacal silver nitrate. Mau- 

 meni uses an excess of copper solution, filters, adds am- 

 monia to the filtrate and estimates the residual copper by 

 titration with sodium sulphide, for which Perrot substitutes 

 potassium cyanide. Lastly. Pavy adds ammonia to the al- 

 kaline cupric solution, and runs in the sugar solution till 

 the hot liquid is decolorized. 



* From an Advance-Shee of Allen's " Commercial Organic Analysis," 

 vol. ii. 



METEOROLOGICAL REPORT FOR NEW YORK CITY FOR THE WEEK ENDING DEC. 17, 1881. 



Latitude o°45'58"N.; Longitude 73 57' 58" W.; height of instruments above the ground, 53 feet ; above the sea, 97 



feet ; by self-recording instruments. 



BAROMETER. 



THERMOMETERS. 





MEAN FOR 

 THE DAY. 



MAXIMUM. 



MINIMUM. 



MEAN. 





MAXIMUM. 





MINIMUM. 



maxi'm 



DECEMBER. 



Reduced 

 to 



Freezing 



Reduced 



to 



Freezing. 



Time. 



Reduced 

 to 



Freezing. 



Time. 



Dry 

 Bulb. 



Wet 

 Buib. 



Dry 

 Bulb. 



Time. 



Wet 

 Bulb. 



Time. 



Dry 

 Bulb. 



Time. 



Wet 

 Bulb. 



Time. 



In Sun 



Sunday, ii.- 

 Monday, 12.. 

 Tuesday, 13- - 

 Wednesday, 14 . 

 Thursday, 15.- 

 Fiiday, 16.. 

 Saturday, 17-. 



30-432 

 30.292 

 30.021 

 29.806 

 30-I77 

 3o-4 2 7 

 30.232 



30-476 

 30.476 

 30.110 

 29.938 

 30.322 

 30.492 

 30-39° 



12 p. m. 



a. m. 



a. m. 



a. m. 

 12 p. m. 

 11 a.m. 



a. m. 



30.362 

 30.110 

 29-938 

 29.688 

 29.900 

 30.322 

 30.176 



a. m 

 12 p. m. 

 12 p. m. 



4 P- n». 



a. m. 



a. m. 

 12 p. m. 



27.0 

 38.0 

 5»-3 

 563 

 30.3 

 24.0 

 33-7 



25-7 

 36.0 

 47.6 

 S2.7 

 29.6 

 23.0 

 3 l -3 



31 

 43 

 59 

 67 

 40 

 29 

 40 



4 P- m- 



6 p. m. 

 12 p. m. 



4 a. m. 



p. m. 

 ex p. m. 



a. m. 



29 

 43 

 54 

 , 60 

 40 



23 



36 



4 p. m. 



6 p. m. 

 12 p. m. 



4 P ">■ 



a. in. 

 11 p. m. 



4 P- m- 



20 

 29 

 41 

 40 



26 

 18 



25 



7 a. m. 



6 a. m. 

 5 a. m. 



12 p. m. 

 12 p. m. 



7 a. m. 

 4 a. m. 



20 

 29 

 40 

 40 

 26 

 18 

 25 



7 a. m. 



6 a. m. 

 5 a. m. 



12 p. m. 

 12 p. m. 



7 a. m. 

 4 a. m. 



93- 

 74- 

 95- 

 69. 

 60. 

 92. 

 88. 



Mean foi the week 30. 198 inches. 



Maximum for the week at 11 a. m., Dec. 16th 30.492 " 



Minimum " at 4 p. m., Dec. 14th 29.688 " 



Range 804 '• 



Dry. Wet. 



Mean for the week 37.2 degrees 35.1 degrees. 



Maximum for the week.at 4 pm., 14th 67. at 4 pm 14th, 60. 



Minimum '* 7 am., 16th 18. " at 7 am 16th, 18. 1 



Range " " 49- "' 4 2 - 



WIND. 



HYGROMETER. 







Dl RECTION. 



VELOCITY 













IN MILES. 



DECEMBER. 









Distance 







7 a. m. 



2 p. m. 



p. m. 



for the 













Day. 



Sunday, 



11. 



n. w. 



w. 



s. w. 



125 



Monday, 



12. 



e. 



s. 



s. w. 



187 \ 



Tuesday, 



«3- 



s. w. 



w. s. w. 



w. s. w. 



274 



Wednesday, 14- 



s. w. 



s. w. 



n. n. e. 



303 



Thursday, 



»5- 



n. w. 



n. 



n. n. w. 



238 



Friday, 



16. 



n. n. e. 



n. n. e. 



n. w. 



128 



Saturday, 



«7- 



w. s. w. 



w. s. w. 



w. 



263 



FORCE IN 1 



LBS. PER FORCE OF VAPOR. 

 SQR. FEET. 



RELATIVE 

 HUMIDITY. 



Time. 



1} 4.30pm .108 .130 .137 



7 7.20 pm .149 .177 .244 



&f 3 5°P m -244 -282 .336 91 



6 10.50 am .367 .420 .288 71 



t\ 3.15 am .181 .137 .153 100 



2 1 2.20 am .098 .106 .136 100 



3i 3.00pm, .141 .144 .157 ioo 



CLOUDS. 



CLEAR, 







OVERCAST. 



10 



E 



£ 



B 



rt 



d 



d 





N 



o 



O 



4 cir. cu. 



2 cir. cu. 



9 cu. 



10 



10 



10 



4 cir. cu. 



5 cu. 



8 cu. 



q CU. 



10 



10 



8 cir. cu. 



















1 cir. 



2 cir. 







RAIN AND *SNOW. 



DEPTH OF RAIN AND SNOW 

 IN INCHES. 



lime 



of 

 Begin- 

 ning. 



Tic-.e 



of 

 End- 

 ing. 



Duiu- 

 tion 

 h. m 



C V 



I! 



< 



7 pm 



10 pm 



3.00 



•03 



9 am 



12 pm 



15.00 



.40 



am 



8.30 am 



8.30 



.40 











Distance traveled during the week 1,518 



Maximum force 7 



•Thursday, 15th, ltf. 



miles 

 lbs. 



Total amount of water for the week 83 inch. 



Duration of rain 1 day, 2 hours, 30 minutes. 



DANIEL DRAPER, Ph. D. 

 Director Meteorological Observatory of the Department ol Public Parks, New York. 



