Dr Barry on Fimparous Generation. 213 



similated to the nucleus, which nucleus, therefore, it is that is 

 reproduced ; this nucleus being a portion of the remarkable 

 substance, hyaline, the production of which I have stated to be 

 the main purpose for which cells are formed. 



26. The changes which the hyaline undergoes, appear to be 

 essentially the same wherever it is found, so that many of 

 those which I am about to mention, regarding one class of ob- 

 jects, may be understood as essentially applicable to all. 



27. I select the corpuscles of the blood as objects very easily 

 obtained, and therefore presenting to other observers the 

 means of testing the accuracy of my observations. It is pro- 

 per, however, to remark, that no observer can learn the struc- 

 ture of the blood-corpuscles, who does not carefully investigate 

 their mode of origin, and patiently follow them through all 

 their changes. 



[The observations here referred to will be found recorded 

 in the London, Edinburgh, and Dublin Philosophical Maga- 

 zine, 1st May 1843.] 



34. I have no doubt that Dr Henle is right in his opinion, 

 that the blood-discs elaborate the liquor sanguinis. But how 

 is it that they do so ? I apprehend it to be in the manner im- 

 plied by the description just given. The red blood-discs ap- 

 pear to be floating centres of assimilation. They derive nou- 

 rishment from the liquor sanguinis, which has received the 

 chyle ; giving in return, or rather resolving themselves into, 

 hyaline. 



38. I am indebted to the kindness of William Addison for 

 a paper just published by him,* in which, after stating that 

 the researches forming the subject of it were commenced, and 

 many of the results committed to paper, previously to the pe- 

 rusal of my memoirs " On the Corpuscles of the Blood," t the 

 author adds, that, so far as his observations have extended, he 

 is enabled to confirm my conclusion. This remark applies to 

 " epithelial cells, pus-corpuscles, tubercle, tubercular infiltra- 

 tions, and hepatization of the lungs.^J These he finds to be 

 derived from the colourless corpuscles of the blood, which 

 with me he traces back to the nuclei of the red ones. 



* On Inflammation and Tubercle. 



t Printed in the Phil. Trans, for 1840 and 1841. J Loc. Cit.Xf. 4. 



