I08 PROCEEDINGS MANCHESTER INSTITUTE 



So far as observed the two forms do not grow together, though H. psychodes 

 is found in both stations of the late form. The forms are persistent, being found 

 in the same stations year after year. The personal observations of the compiler 

 extend over a period of six years. The white form had been known for an indef- 

 inite period before his observations began. 



*i5 Cypripediiun pubesceiis, Willd. 



A number of these plants were removed to a "wild bed " in a city lot. There 

 they have thriven and multiplied for several years. During this time the plants 

 have undergone a marked change in appearance, becoming smaller and producing 

 smaller flowers, in which the lip is strongly compressed laterally, is more pointed 

 at the apex and has assumed a paler shade of yellow. Several plants of C. parvi- 

 florum which were set out at the same time have undergone no apparent change 

 from year to year. It seems, therefore, more likely that the changes in C. pubes- 

 cens are the result simply of the changed habitat and not of cross-fertilization 

 with C. parviflorum. 



*i6 Salix. 



This baffling genus is not yet well understood. The list given is but tentative 

 and takes no account of the numerous hybrids, which doubtless exist here as 

 everywhere. 



*i7 Betula nigra, L. 



The red or river birch is very abundant along Beaver brook in Pelham for at 

 least four miles north of the Massachusetts line. The trees are undoubtedly 

 members of a westerly extension into this corner of New Hampshire of the remark- 

 able station discovered many years ago at Spickett Falls in Methuen, by Mr. 

 George B. Emerson, and described in his Trees and Shrubs of Massachu- 

 setts, [q.v.) 



*i8 Quercus. 



Manchester is unusually rich in oaks. Of the eight species named the most 

 abundant is coccinea, the rest following in about this order — alba, ilicifolia, rubra, 

 prinoides, tinctoria, bicolor, Prinxis. They may all be found in the compass of a 

 square mile in West Manchester. 



*i9 Quercus Prinus, L. 



Two stations of the rock chestnut oak have been examined, one in Manches- 

 ter at Rock Rimmon, the other in Auburn, six miles distant. The cutting of the 

 leaves varies greatly, those on the finest, best-developed trees being often as near- 

 ly entire as those of typical bicolor or of the chestnut, while on stunted, ill-devel- 



