^jTumal, jLTy!!imT NOTES AND MEMORANDA. 55 
18. Stentor Millleri (Infusorial). 19. The same; retracted into its 
tube. 20. The same ; detached and swimming freely. 21. Vorticella 
nehiilifera (Infusorial). 22. Volvox glohator (Confervoidse). 23. Euas- 
trum didelta (Desmid). 24. Cosmarium tetraophthalmum (Desmid). 
25. Pediastrum granulatum (Desmid). 26. Closterium lunula (Desmid). 
27. Closterium moniliferum (Desmid). 28. Micrasterias denticulata 
(Desmid). 29. Tahellaria ? (Diatom). 30. Spirogyra 
(Confervoidas). 31. Licmophora (Diatom). 32. Synedra 
(Diatom). 33. Arcella vulgaris (Infusorial). 33*. Attached zoospore 
of Conferva. 34. Stigeoclonium protensum (Confervoid£e). 35. Cos- 
marium ■ ? (Desmid). 36. Bulhochaste setigeria. 
We would especially call attention to the Floscularia, which, when 
looked at with a lens (and by the way all the figures bear magnifica- 
tion), is exquisitely life-like. Mr. Kichter has selected for his picture 
the motto " Maxime miranda in minimis," which he certainly has done 
much to establish. The photographs are sold by Messrs. Ross, of 
Wigmore Street, and Messrs. Baker, of Holborn. 
Microscopical Slides. — The American " Essex Institute " has 
established a sort of manufactory of microscopical sections of all 
kinds. Mr. Alpheus Hyatt, the author of a memoir of the Polyzoa, is 
the secretary, and to him communications, objects, &c., should be 
addressed. The following is the prospectus published : — " This estab- 
lishment, founded by the liberal aid of citizens of Salem, Boston, 
and New York, is now in successful operation. We have secured the 
services of the well-known preparator, Mr. E. Bicknell, and the com- 
pleteness of our apparatus affords facilities for the production of a 
style of slide inferior to none, whether of native or foreign manufac- 
ture. We will supply suites of Histological specimens for educational 
purposes. Preparations of bone, teeth including the jaw, shells, corals, 
spines and shells of Echini, or other hard tissues ; also thin sections 
of wood. Preparations of injured grain with its microscopial pests, 
if specimens are sent or special orders given. Suites of specimens 
suitable for the beginner in microscopy, or for the connoisseur seeking 
amusement and instruction combined. Coarser Preparations. — Shells 
and corals, fossil or recent, cut and polished. These show the colu- 
mella of the shells, and the cells of the coral in the most effective 
way for general study. Slides or preparations will be exchanged for 
specimens desired. Special attention given to preparations intended 
for scientific investigation. 
A Year-Book of American Entomology during the year 1868 is 
about to be issued. It will be edited by Dr. A. S. Packard, jun., 
whose excellent treatise on insects we some time since noticed in these 
pages. Dr. J. L. Leconte will contribute a chapter on the Cleoptera ; 
Mr. S. H. Scudder, chapters on the Butterflies and Orthoptera ; Baron 
E. Osten Sacken, a chapter on the Diptera ; Mr. P. H. Uhler, a chapter 
on the Hemiptera and Neuroptera; the Editor, chapters on the 
Hymenoptera and Moths; and Dr. Hagan, an article on the False 
Scorpions. 
What tne Microscope has done. — In a paper, written by M. 
Lowenthal, and published in the Pharmaceutische Zertschrift fiir Buss- 
land (April), an account is given of one of the most striking disco- 
