Natural History, ' ' 4Sf' 



Thus M. Raspael's idea relative to the formation of Testable 

 cellular tissue, is supposed to be proved, the evidence being such 

 that any one can refer to it at pleasure. The cellular tissue is 

 composed of teguments, these of agglutinated globules, and these 

 may be conceived to be composed of other globules, and so on to 

 infinity. 



The same phenomena being sought for in germinating grain 

 were perfectly observed, and another analogy between the grains of 

 fecula and many other organic grains established. M. Raspael 

 found that the grains of fecula gradually emptied by the progress 

 of germination were organised precisely like grains of pollen, and 

 that poUenic granulations might be observed in their centre with 

 perfect facility. This fact led him to study the grains of pollen 

 particularly, and being occupied at the same time with lupuline, 

 numerous analogies were elicited, of which the following are the 

 principal. 



The grains of pollen are composed of a vesicle, containing a 

 variable number of other vesicles which enclose the granules that, 

 when detached from their surface, contribute to fecundation. Lu- 

 puline is spread over all the yellow leaves of the hop, as well as 

 over the scaly cones of the female flower ; and they are detached 

 only as these leaves are developed. Guettard designated these 

 grains of lupuline by the name of vesicular glands^ which are found 

 on a multitude of other vegetables. 



The glands of other vegetables have the same organization, 

 though they do not all contain the same substances. Cortical pores 

 are merely cells, which, according to an organization identical with 

 that of pollen and glands, contain one or two vesicles filled with 

 granulations. 



Generally, leaves which have not vesicular glands are supplied 

 with these pretended cortical pores. Those which have no cortical 

 pores are supplied with glands, more or less modified in their 

 structure. 



Every thing induces M. Raspael to believe that the lupuline, the 

 glands, and the cortical pores, are destined, like the grains of pollen, 

 to cause the fecundation of the buds ; and that, in experiments on 

 generation by means of the two sexes, it is these organs which 

 have sometimes replaced the action of the stamens, and puzzled 

 the sagacity of observers. — Bull. Philom. 1826, p. 155. 



11. Experiments on the Fecundation of Vegetables ^ by M. Gaert- 

 ner. — In consequence of the doubts and discussions which have 

 arisen in Germany relative to the sexual system in plants, M. 

 Gaertner has been induced to make a multitude of experiments, for 

 the purpose of obtaining undoubted knowledge upon this point. 

 The experiments have been made upon four different families of 

 plants, containing thirty species, belonging to sixteen genera: 

 although about six hundred in number, they are still to be con- 



