l''l-5] Michael, ct al.: Iliidrograpliir Records of Scripps Iiistitutioii 17 



of 1° C in the course of half a niimite. within 0?1 in one minute, 

 within 0?02 in two and one-half minutes, and within an error of a few 

 thousandths of a degree in five minutes. As the thermometer will 

 gradually approach the final reading while lowered, it is our custom 

 to wait another two or three minutes, depending upon the depth, 

 before revensing the instrument, thus insuring an accuracy of about 

 0?0] C. We have, however, read the thermometer directly without 

 employing a microscope so that our error is somewhat larger, varying 

 between 0?01 and 0?03 C. 



The water samples obtained with the Ekinan bottles are nearly 

 always preserved in green glass bottles having a volume of 250 c.c, and 

 provided with a patent china stopper fitted with a suitable india-rubber 

 washer. A small lever of stiff wire is used to pre.ss the stopper 

 firmly into the neck of the bottle. These bottles were purchased from 

 the Central Laboratory of the International Commission at Christiania, 

 and are in general use throughout the world. They have proven 

 exceedingly satisfactory both as regards ease of handling and trans- 

 portation and a.s an almost perfect means of preventing evaporation 

 (see p. 25). 



4. METHOD OF EECOEDING 



Since 1908, when the "Agassiz" began work, no pains have been 

 spared to make our .system of recording of the highest efficiency. With 

 this end in view a double-entry plan was adopted and is still in use. 

 After the hauls and water samples are transfered to containers, the 

 recorder labels each one. For this purpose he is provided wnth haid 

 and water sample books consisting of tags about IVl; inches square 

 made of the best linen paper. Printed along the left-hand margin of 

 each tag are the following items : 



Haul tag-booh Water sample tag-book 



Haul no. Water sample no. 



Apparatus Haul no. 



Date and time Date and time 



Position Position 



Depth Depth 



Bottom Temperature 

 Water sample no. 



The recorder enters on each tag the information called for, using 

 a soft lead pencil except in case of haul (and water sample) numbers ; 

 these being recorded in sequence irrespective of the nature of the haul 



