1883.] 



MICROSCOPICAL JOURNAL. 



17 



then heated so that it will dissolve still 

 more of the salt. A cell is then filled 

 with the warm solution, and immediately 

 sealed. Upon cooling, the crystals will 

 be deposited within the cell in a most 

 beautiful manner, and their lustre is re- 

 tained. Glycerine is sometimes used as a 

 solvent. Gold-size is recommended as a 

 suitable cement. — The Microscope. 



— Mr. L. Schrauer, of New York, has 

 devised a new form of nose-piece for 

 microscopes, to facilitate the changing of 

 objectives. It consists of two parts: the 

 upper part screws into the ordinary nose- 

 piece, where it is to remain permanently 

 attached ; the lower part, called an adap- 

 ter, carries the objective. There must 

 be an adapter for each objective, and 

 objectives are changed by shding the 

 adapters out and in, no screws or springs 

 being required. We find it difficult to 

 describe the apparatus satisfactorily, al- 

 though it is extremely simple. 



— The co-partnership hitherto existing 

 between the firm of R. & J. Beck, of 

 London, and Mr. Charles Coppock, hav- 

 ing come to an end by the limit of time, 

 Mr. Coppock has gone into the business 

 of a practical and manufacturing optician 

 on his own account, and has estabhshed 

 his business at 100 New Bond Street, 

 London. 



— The Sattitariait, published in New 

 York, begins its eleventh volume as a 

 weekly quarto of 16 pages, printed in 

 clear type, on good paper. We congratu- 

 late the editors upon the prosperity of 

 the magazine, which occupies a field in 

 which there is an opportunity for doing 

 much substantial good for every city 

 and community. 



— The New York Medical Journal, 

 which has reached its thirty-seventh vol- 

 ume, began as a weekly with the number 

 of January 6th. That number opens with 

 the first of the series of lectures on 

 human automatism, delivered at the 

 Lowell Institute, Boston, by Dr. W. B. 

 Carpenter. In its present form t\\t Jour- 

 nal will, doubtless, meet with still greater 

 favor than in the past among practising 

 physicians. 



— We have received the October num- 

 ber of Mr. Thomas Bolton's " PortfoHo 

 of Drawings and Descriptions of Living 

 Organisms." It is a very useful publica- 

 tion, if all the numbers are equal to the 

 one before us, and if it were better known 

 in this country, no doubt it would be 



valued by many who are interested in 

 pond-life. 



— If the United States Congress de- 

 sires to do something for the benefit of 

 the country at large, it might well follow 

 the example set by the French Minister 

 of Agriculture, who has placed $10,000 

 at the disposal of M. Pasteur, to continue 

 his investigation of contagious diseases 

 of animals. Does Congress know how 

 much money the Department of Agricul- 

 ture of this country has saved through 

 such investigations already made with 

 entirely inadequate means .'' When the 

 money value of such investigations be- 

 comes known, $10,000 will seem like a 

 very small amount to be annually appro- 

 priated to this one purpose. 



CORRESPONDENCE. 



To THE Editor. — In the December 

 number of your Journal, in the review 

 of the Proceedings of the American 

 Society of Microscopists, you make, un- 

 intentionally no doubt, some unjust com- 

 ments on the article on the Fasoldt Stage 

 Micrometer, which 1 prepared for the 

 Society, and which was published in the 

 Proceedings. When you intimate that 

 an injustice had been done Professor 

 Rogers, it would almost seem that you 

 had not read the paper, but had onlv 

 glanced at certain portions of it. It will 

 be remembered that the special object of 

 the work was the measurement of the 

 Fasoldt plate, which had been turned 

 over to me by the Society for that pur- 

 pose. The measurement of the two or 

 three other micrometers was made solely 

 for the purpose of comparison, that the 

 reader might be able to see something of 

 the regularity with which such plates run. 

 They were all plates which I happened 

 to have at my command, and I made no 

 assertion that they represented the best 

 work of their respective makers. In the 

 case of the Rogers plate, I expressly 

 stated that the work was by no means up 

 to the standard of his recent rulings, and I 

 was glad to avail myself of the opportunity 

 offered by Gov. Cox to examine a more 

 recent micrometer. The measurement of 

 this plate was made at some personal in- 

 convenience, in order that the result 

 might be included in the report, and to 

 remove any suspicion of a desire not to 

 represent Professor Rogers fairly, it is 



