284 PHYSIOLOGICAL BOTANY. 



the parent-cell, and only undergo partial separation in 

 the highest stage of their development/' Hence the 

 result is that, even in pollen, the formation of cells from 

 a cell-nucleus never occurs. 



In the 'Flora/ 1844, p. 359, FACCHINI communicated 

 the Investigations of AMICI of Florence, upon the impreg- 

 nation of the Embryo which are opposed to Schleiden' s 

 theory of the development of the embryo. Schleiden did 

 not omit at once answering them, 1. c. 787. Eacchini 

 therefore gave the Italian text of Amici s memoir, as it 

 exists in the Transactions of the ' Scienzati' of Padua, with 

 the remark, that all present were convinced by Amici. 

 Schleiden, 1. c., 593, then accuses all who were present 

 of gross ignorance, and abuses Aimer's figures in his 

 peculiar style. Any one who wishes to know how Amici, 

 the discoverer of the pollen-tube, is treated, may read this 

 paper. We gladly turn from this subject to a remarkable 

 work 



Experiments and Observations upon the Organs of 

 Fructification of the more Perfect Plants. By C. FR. 

 GARTNER, Stuttgard, 1844-8. We have here such an 

 abundance of experiments and observations made with 

 great calmness and circumspection, that we may assert 

 with truth, that no modern work has contributed so 

 much to the physiology of plants as the present. This 

 is not the place for carefully going through the whole, we 

 can only enter generally upon it, and notice a few of the 

 various points on which it treats. Moreover, in addition 

 to the new and peculiar results which it contains, we have 

 in every case a notice of the opinions of others, which are 

 contradicted or confirmed by reasoning and experiment. 

 1 . On the Flower. Cause of the abortion and falling off of 

 the flower. 2. Of the Calyx. If the impregnation of the 

 ovary has not been effected, the calyx decays, and assumes 

 a diseased appearance ; it remains in this state for several 

 days, according to the species of the plant. 3. On the 



