﻿ON THE METHODS OF SECTION CUTTING. 



47 



slightly larger half of the specimen. Secondly, after completing the longitudinal 

 section, take the same halfoi the cylinder from which this longitudinal section was 

 made, and then orient the supplementary series of transverse sections carefully in 

 the light of what it shows. Otherwise, owing to the intervening saw-cut, it will 

 always require more or less inspection to trace the several parts in the series of 

 sections. Furthermore, although of minor scientific moment, correspondence of 

 organs in the complementary serial sections is as desirable for the beauty added as 

 the precision of examination thus permitted. 



VII 



jr xr 

 m 



XIV 



Fig. 14. — Cycadeoidea dacotensis. T. 214 % nearly. 



Side view of trunk after drilling out in the form of cylindrical cores the fruits numbered V, VI, VII, XI, XIV, and XVI. 

 The numbers 1-5 indicate similar fruits embedded in the armor and surrounded by bract systems. At XV a cylindrical 

 core is shown after the drill cut has been made, but still in its natural position unbroken from the trunk. As may be 

 noted in the figure the end of the core is protected by a cement covering. This consists in one part of the " Meyer- 

 ische Steinkitte " to four of finely pulverized cycad, as employed in the later cutting. Other views of this trunk appear 

 in later chapters. 



