GULLIVER ON THE MINUTE ANATOMY OF ANIMALS. 143 



kinds of particles seem to me to be differently affected under precisely 

 the same treatment. Thus the nucleus of the blood-corpuscle is not so 

 prone to change in drying as the lymph-globule. The former, whether 

 exposed in recent blood by acids, or in dry blood by the moisture of the 

 breath, may be quickly dried, and the form of the nucleus thus com- 

 pletely preserved, on the slip of glass used to make the observation ; 

 while the lymph-globule after similar treatment, and even if dried with- 

 out any addition, becomes either faint, tumid, or misshapen. Certain 

 saline solutions too, which, in a few hours, either injure the shape of 

 the lymph-globules or render them almost invisible, do not act so re- 

 markably on the nuclei of the blood- discs. 



The pale globules noticed in this paper are those well-known white 

 and slightly granular corpuscles which are generally seen at once very 

 plainly in the blood, as they appear, under certain adjustments of the 

 object-glass, with a distinct and dark circumference. But there are 

 other pale particles in the blood. Some of these are isolated, and agree 

 in all respects with the globules of the lymphatic juices, being smaller, 

 often rather fainter and with a less definite contour than the pale glo- 

 bules first mentioned. In the blood after death there is also frequently 

 observable small shapeless white fragments consisting of circular or 

 oval granules hardly as large, seldom larger, than the globules of the 

 lymphatic fluid ; and minute oil-like particles are often seen in the frag- 

 ments. In birds this granular matter often exactly resembles in struc- 

 ture the colourless fibrine, obtained from their blood by washing it in a 

 linen bag, and the granules are frequently just like the nuclei of the 

 blood- discs. The white granular matter is often abundant when the 

 pale globules are either difficult to be found or entirely absent. 



The following measurements of the lymph-globules are expressed in 

 fractions of an English inch ; the common sizes are first noted, then 

 a space is left, after which the measurements of the small and large 

 globules are given ; and lastly, beneath the lines, the mean size de- 

 duced from the whole observations : 



1. Pigeon (Columba Lima, var. 



Briss.) 



1-6000 

 1-5333 



1-7110 

 1-3800 



1-5274 



2. Song Thrush (Turdus musi- 

 cus, Linn.) 



1-6000 

 1-4800 



1-8000 

 1-3500 



1-5090 



