362 On the Porm of the Globules of 



cumference of the petals, and shaded off towards the centre, 

 I was much surprised, on inverting the clot, to find a most per- 

 fect representation of the flower upon its surface, not only 

 giving its outline with the utmost accuracy, but the different 

 shades of the bright red corresponding in intensity with the 

 darker and lighter parts of the ornament, so as to present to 

 the eye a very fair image of the flower itself. On examining 

 the cup minutely, it appeared to me that the colours had been 

 laid on by the brush, and the margin of the petals of the 

 flower being darker than towai'ds their interior, was propor- 

 tionally elevated. Subsequent experiments with the same 

 cup produced the same result. This is the only instance, 

 however, in which I have observed an effect from any other 

 colom' than green ; and, during the course of my observations, 

 I have employed cups with almost every variety of ornament, 

 both as regards device and colour. 



It is unnecessary to add, that this single observation at once 

 put an end to any conjectures which I might have formed as 

 to the green colour being indispensably connected with the ef- 

 fect. Whilst, on the other hand, it has left me still more in the 

 dark than ever, as to the cause of the appearance I have ven- 

 tured to describe. Nevertheless, I have thought it right to de- 

 tail, in the way I have done, the difterent steps I have pursued 

 in my inquiries, unsuccessful though these have been, in the 

 hope that my doing so may aid in suggesting to others, some ex- 

 planation of the phenomenon which I have been unable to 

 give, as well as facilitate the inquiries of those who may be 

 disposed to prosecute the investigation farther. The sub- 

 ject is one which has interested me not a little ; and I shall cer- 

 tainly not lose sight of any opportunity which may offer of 

 procuring additional information that may tend to throw any 

 light upon it. 



On the Form of the Globules of the Blood in some Mammifera* 



The blood fulfils, in the animal economy, so important a 

 part, and its history is connected with so many questions full 



* From " Rapport fait a TAcademie des Sciences le 31 Decembre 1838, 



