of dried Infusoriii, mid oilier microscopic Objects. 91 



ceeded in mnking a very satisfiictory dried collection, not only 

 of nearly 300 s})ecies of Infusoria, but also of other kinds of 

 microscopic objects. He mounts them between double plates of 

 mica, fixed in the cells of slides, in the usual manner of prepar- 

 ing the scales of butterflies and Podurcc, and other transparent 

 microscopic objects; and thus, he says, " I have not only pre- 

 served the form and colour of the shielded (cuirasses) Rota- 

 toricE and Bacillaricc, but also the softest and most delicate of the 

 ■polygastric Infusoria, even those of the genus Monas; as well 

 as the tissue of plants ; the Spermatozoa and Ccrcarice ; the 

 difFerent sons of globules of blood, with their nuclei; globules 

 of lymph, chyle, and milk; and the nervous tubes, &c., of a 

 great number of animals, and of man." 



A power of about 300 (linear) is sufficient for viewing these 

 objects, " but a lower power does not show them satisfactorily, 

 however well they may be illuminated." 



I subjoin a list of the subjects presented to the Museum, 

 and remain, Dear Sir, faithfully yours, 



John Geo. Children. 



Slide, No. 1. 

 1. Monas viridis. 



5. Pol)'soma iivella, and Monas 

 ternio. 



3. Spirillum undula, and Vibrio ba- 



cillus. 



4. Euglenia acus ; Eu. viridis; Eii. 



pyrum. 



5. Coieps hirsutus. 

 G. Volvox globator. 



No. 2. 



1. Paramecium caudatum. 



2. Glaucoma scintillans. 



3. Tricboda carniiim. 



4. Carcbesiuin polypinum. 

 .5. Epistylis nutans. 



(i. Euplotes Charon. 



No. 3. 



1. Stentor niger. 



2. Paraineciiun aurelia. 

 .'{. Glaucoma scintilhuis. 

 4. Stentor polyiuorphus. 

 .5. Stftntor cccruleus. 



(5. Idem — compressed, to sliow the 

 testiculi. 



No. 4. 

 Nassula ornata. 

 Nassula elccans. 



3. Nassula aurea. 



4. Idem — criislied, to show the 



teeth. 



5. Chilodon uncinatus. 



6. Chlamydomonas pulvisculus. 



No. 5. 



1. Hydatina senta. 



2. Idem — crushed, to show the 



teeth. 

 .3. Polyarthra trigla. 



4. Brachionus pala — with its eggs. 



5. Brachionus rubens — ditto. 



6. Anura;a aculeata. 



No. 6. 



1. Globules of iilood of the Sheep 



fOvis aries). 



2. Ditto of the Frog (Rana tem- 



poraria). 



3. Grains of the Retina of the Eye 



of the same. 



4. Spermatozoa vespertilionis mu- 



rini. 

 "). Arhnniidies longipes. 

 0. Meridion vernale; Fragilaria 



rhabdosoma ; Navicula acus ; 



Na. amphisbtena. 



L2 



