46 



ORGANOGRAPHY. 



like form {fig. 100). Compound hairs may be also undi%'ided, 

 as is more frequently the case {figs. 103 and 104), or branched 



Fig. 96. Fig. 97. Fig. 98. 



V V J 



Fig. 100. 



Fig. 99. 



Fig. 101. 



Fig. 102. 



Fig. 96, Simple unbranched hair of the eomtnon Cabbage Fig. 97. Forked 



hair of Whitlow-grass (Drabn). Figs. 98 and 99. Branclied stellate 



hairs of Alyssum Fig. 10(1. Stellate hairs from Allh(jea officinalUt. 



Fig. 101. Branching hair of n species of Marrtihium. Fig.\Q2 



Branclied hair of Allernanthera (urilluris. From llenfrey. 



{figs. 101 and 102). The component cells of such hairs may be 

 also variously arranged, and thus give a variety of forms to 

 them. Commonly the cells of such hairs are placed end to end 

 in a single row, so that they arc more or less cylindrical ; when 

 the component cells are contracted at the ])oints where they 

 come in contact, they form moniliform or necklace-shaped hairs 

 {figs. 103 and 104). "When tlic cells below are larger tlian those 

 above, so that they gradually tajicr upwards to a point, they are 

 conical; or when gradually larger from the base to the apex, they 

 are clavate or club-.sh(tpe(l {fig. 105); or when suddenly enlarged 

 at their ai)ex into a rounded head, capitate {fig. 106); when they 

 are terminated by a hook on one side j)ointing downwards, they are 

 uncinate or lioohed {fig. 107); or if presenting two or more hooks 

 at their apex, they are glochidiate or barbed {fig. 108). Such 

 hairs again, instead of being erect, or more or less obliijue upon 



