Progress in Microscopical Science. [March, 
engaged in any kind of scientific research. The “record of 
current researches ” has also been greatly extended, and the 
contents of the whole volume rendered most acceptable by 
copious indexing, which takes the following forms : A care- 
fully arranged table of contents occupying eighteen pages 
lists of plates and woodcuts, and a very full alphabetical 
index, in which the repetition of subjects under different 
letters has not been spared. The energetic Secretary of the 
Society, finding the work of conducing such a publication 
beyond the power of any single individual, , has called to his 
aid the three gentlemen mentioned in the title, whose united 
efforts have made the work an almost perfect record of mi- 
croscopical and biological research. . . 
The Royal Microscopical Society, desirous of making 
others partakers of its good things, has elected the presidents 
of eighty-six kindred societies, at home and abroad, ex officio 
Fellows : these, with the numerous Honorary Fellows, place 
the Society in communication with observers in most places 
throughout the world. . . , , 
A careful series of experiments, to determine the thermal 
death-point of known Monad germs when the heat is en- 
dured in a fluid, have been carried out by the Rev. W. H. 
Dallinger, F.R.M.S., so well known for his researches in 
the life-history of Monads, in conjunction with Dr. John 
Tames Drydale, of Liverpool. The processes employed are 
necessarily elaborate, and need special appliances for the 
nurpose of microscopical observation, the whole of which 
are described in detail in the paper communicated to the 
Roval Microscopical Society.* As might be expected the 
adult organisms were less capable of enduring a rise of 
temperature than the germs, a heat of from 140 to 142 b- 
being always fatal. With respedt to the germs develop- 
ment took place— after an exposure to 265 —about three 
and a half hours after the heating process : a temperature 
above 267°, however, proved fatal to the germ. The heat 
endured dry was much greater, a spore germinating after 
exposure to a temperature of 250°, a temperature of 212 m 
fluid being fatal. , f 
A paper by Mr. J. W. Groves, on the Preparation of 
Stained Seaions of Animal Tissues,” appears in tne 
“ Transactions of the Quekett Microscopical Club (voi. v., 
p 2Si) The author remarks that although the staining ot 
tissues by the more simple dyes is very easy, yet of the large 
number prepared scarcely any are ever so stained as to show 
* Journal R. M. S., vol. iii., p. 1. January, 1880. 
