570 



MK. D. H. SCOTT OS THE ABTICTinATED 



Fig. 3. Fi S- 4 - 



Fig. 3. Hevea Sprtcceana. Tangential section from outer part of phloem of a 

 stem about 7 millim. thick. I, laticiferous vessels with perforations 

 in their lateral walls ; at t, remains of a transverse wall ; p, phloem 

 parenchyma. X 365. 



Fig. 4. H. Spruceana. From a radial section of the phloem ; I, laticiferous 

 vessel seen from the surface, showing perforations in the lateral wall. 

 X460. 



Since the publication of my papers in April 1884, a work has 

 appeared by Dr. Pax in Engler's ' Jahrbuch f iir Systematik,' having 

 for its subject the Anatomy of the Euphorbiacese in relation to their 

 Classification. The author has investigated the anatomy of spe- 

 cies belonging to a very large number of genera, and has arrived 

 at some conclusions bearing on my present subject. As the 

 result of his very extensive observations, Dr. Pax makes the im- 

 portant statement* that only a small portion of the large family 

 of the Euphorbiaceae possess inarticulated laticiferous tubes, such 

 as were investigated by Schmalhausen. Dr. Pax tabulates the 

 results of his investigations on this point as follows : — 

 * Engler's Jahrb. fiir Syst. xv. 1884, p. 404. 



