SIR J. LUBBOCK — PlIYXOBIOLOaiCAL OBSERTATIOXS. 



3G5 



Now in most genera, as In tlie Cliiekweed, Slcllaria, Sjyergu- 

 laria, Cerastium, &c., the seeds arc laterally compressed; the 

 cotyledons consequently lie transversely to the seed, and their 

 Avidtli therefore is limited by the thickness of the seed, as in 

 fig. 58. The case is, however, somewhat complicated by the fact 

 that the seed and embryo are both curved. 



Fig. r)8 



I 



Ccrastium arvcnse, X 15 



On the other hand, in the Pink (fig. o9) the seeds are not 

 laterally but dorsally compressed, attached to the columnar 

 placenta by the middle of the interior face, so that the cotyledons 

 arc straight, parallel to the seeds, and have in consequence plenty 



of room to widen out. 



I'i.'. .V.) 



I 



W 



Dianthus Caryophjllus, X I-'). 

 In %s. 58 & 59 the letterra. h, and c, d indicate the directions of the sections. 



In Sohmm the fruit is globose, scarlet when ripe gla- 

 brous, "indchiscent, and n.any-sccdcd. Tlie seeds are kiducy- 

 shaped, much compressed laterally, and placed with their narrow 



