212 RED PARTICLES 



In water insects, as the lobster and shrimp, these particles 

 are white ; in some land insects, as the caterpillar and grass- 

 hopper, they appear of a faint green when in the vessels, as I 

 am persuaded from experiments. I have seen them in an in- 

 sect no bigger than a pin's head, and suspect they exist almost 

 universally through the animal kingdom. 



What is so generally extended through the creation, must 

 be of great importance in animal economy, and highly deserv- 

 ing the attention of every inquirer into the works of nature. 



before the same Society, June 19, 1845, by Mr. Wharton Jones, "On 

 the Blood-Corpuscle considered in its diiferent phases of development 

 in the Animal Series." 



Mr. Newport states that the matured blood-corpuscles in the in- 

 vertebrata are always oat-shaped, or oval, but change their form when 

 removed from the body. They commence as minute rounded molecules, 

 which are gradually developed into nucleated oat-shaped corpuscles, 

 within which nucleoli are formed. These corpuscles he regards as 

 analogous to the white corpuscles of vertebrata. When matured they 

 become diffluent, liberate their nucleoli, and supply plastic fluid to the 

 blood. Nearly the whole of these corpuscles disappear in this way in 

 lepidopterous insects, during the first few days of the pupa state, when 

 the organic changes are most active, and very few remain in the perfect 

 insect. From these observations, Mr. Newport, like the physiologists 

 cited in Note cxviu, regards the blood-corpuscle as analogous in func- 

 tion to the secreting cells of glands. The further development of the 

 nucleoli into discs, as stated in his paper, he is now satisfied is incorrect. 



Mr. Jones recognizes three phases in the development of the blood- 

 corpuscle, which he respectively names the phase of granule-cell, the 

 phase of nucleated-cell, and the phase of free cellseform nucleus. In 

 the invertebrata and oviparous vertebrata, the blood-corpuscle ex- 

 ists only in the first two phases. It is found in all the three phases 

 only in man and the mammalia. In the phase of free cellaeform nucleus 

 it is the well-known red corpuscle of man and the mammalia. The 

 red corpuscle of oviparous vertebrata belongs to the phase of nucleated- 

 cell. In the invertebrata the blood-corpuscle in the phase of nucleated- 

 cell does not attain a perfect coloured stage, as in the oviparous 

 vertebrata, but it may be met with slightly tinged red. 



In the lymph of oviparous vertebrata there are granule-cells and 

 nucleated cells ; in the lymph of man and the mammalia there are, in 

 addition to these, free cellseform nuclei. In fact, as regards corpuscles, 

 the lymph of the vertebrata is identical with their blood, the principal 

 difference being that, as regards the lymph of the oviparous vertebrata, 

 the nucleated cells have not attained to the perfectly red stage, whilst, 

 as regards the lymph of man and the mammalia, the free cellaeform 

 nuclei have not attained to their perfectly red stage. A more complete 

 account of Mr. Jones's views will soon be published in the ' Philosophi- 

 cal Transactions.' 



