THE MICROSCOPE. 12? 



entirely absorbed. If it is desired to isolate the parasite from 

 the surrounding debris, do so by patient manipulation under 

 an inch objective, then drop a fresh drop of oil, replace the 

 cover and fasten it with a permanent ring. 



CORRESPONDENCE. 



Diatoms. — H. L. Smith, LL. D., of Hobart College, our 

 best known authority on diatomaceashas sold to Dr. F. E. Hod- 

 ges, F. R. M. S., of Indianapolis, Ind., his entire library on that 

 subject, his collection of thousands of valuable slides, more 

 than 4000 bottles of cleaned diatoms ; also, all of the large col- 

 lection of diatomaceous earths without making any reserve. 



The library has few if any equals, for it contains nearly 

 every book and paper of value ever published on diatomacea?, 

 also much on desmids. It might be difficult to find another so 

 valuable collection of material in all of the other public and 

 private collections in America. 



To Prof. Smith the scientists of the world owe much, for he 

 devoted many years of patient study, as well as a fortune in 

 money, to investigations which gave rich returns to science, but 

 microscopical returns to his pocket, 



Advancing years and his college duties, have made it impos- 

 sible for him to continue the great amount of correspondence 

 which was required, and which was not remunerative ; but 

 which in patst years gave him pleasure ; and as he had the op- 

 portunity to dispose of the entire collection to advantage to an 

 enthusiast now in the prime of life, he has done so. 



Dr. Hodges now has the choicest collection of valuable slides 

 that I have ever seen. — E. H. G. 



RECENT PUBLICATIONS. 



An Introduction to the study of the Diatomaceas. By Fred'k Wm. 

 Mills. London and Washington : 8°, 250 pp., Price 83.50. 



Heretofore, if one desired to take up the study of this group 

 of plants, he was obliged to grope his way through amass of ir- 

 relevant matter contained in the reports of societies, to buy large 

 and expensive volumes, and to hunt up certain old and very 

 rare books. This, he no longer need do. 



