58 Mr Shuttle worth on the Colouring Matter 



of these was, (5M) an infusoria of an oval form, colourless and 

 transparent, enclosing, near one of the extremities, a greyish 

 granular mass. Its greatest diameter was about ^ of a milli- 

 metre, its smallest about -^^. (See fig. 7. pi. 1.) 6M, Some 

 other smaller bodies were spherical, or slightly oval, without 

 colour, transparent at their edge, likewise containing an indis- 

 tinctly granular, greyish mass, and possessing a diameter of 

 about 10 of a millimetre. (See fig. 8. pi. 1.) This form has 

 a striking resemblance to the Pandorlna hyalina of Ehrenberg 

 (1. 0. p. 54. tab. ii. fig. 34.). 7M, Finally, I have observed a 

 single individual, colourless and transparent, apparently com- 

 posed of two spherical globules, united together without any 

 trace of contents, or any organization whatever. The dia- 

 meter of one of these globules might be about ^^o of a milli- 

 metre, or somewhat more. (See fig. 9. pi. 1.) It is possible 

 that this form should be referred to the Manas gliscens of 

 Ehrenberg (1. c. p. 13, tab. i. fig. 14.). In these three colour- 

 less infusoria, 1 cannot affirm that I could discover any motion. 



After having thus described, as accurately as I can, the or- 

 ganic forms which I believe belong to the animal kingdom, I 

 now proceed to describe the true algae of the red snow, and ano- 

 ther devoid of colour, v/hich is to be found in many other situ- 

 ations, and which, in my apprehension, has given rise to nume- 

 rous errors in the description of the Protococcus nivalis. 



Sth, I have observed in small number, but without fail, 

 upon all opportunities, some spherical globules of a brilliant 

 blood-red colour, evidently full of a granular mass, and conse- 

 quently possessing an imperfect degree of transparency. They 

 had all nearly the same dimensions, their diameter being from 

 jIjj to J 5 of a millimetre. (See fig. 2. a. pi. 1.) I have never 

 detected in them either a gelatinous matrix, or a membranous 

 border, or any movement whatever. When bruised, they allow 

 their colouring matter to escape under the form of infinitely 

 small granules, which are very numerous, and the membrane 

 remains torn and colourless. The same efi^ectwas produced by 

 the evaporation of all the water which was under the microscope. 

 (Fig. 2. b. pL 1.) This was the Protococcus nivalis of Agardh, 

 who did not perceive the contained granules, on account of his 

 not employing a sufficiently powerful microscope. 



9th, In the midst, and around all the bodies already alluded 



