34 Trans. Acad. Sci. of St. Louis. 



ventitious buds, which appeared at all points on the trunk and 

 branches. But, with an entire absence of transpiration (or 

 almost so, for the evaporation from the branches and trunk 

 must have been very slight in an atmosphere with high 

 humidity) — this high root activity must soon have stop- 

 ped, owing to the pressure of the water already absorbed. 

 When the new buds developed into leaves, the number of such 

 leaves formed was entirely incomparable to the number which 

 had been on the tree before, and consequent^ the surface 

 from which evaporation might have taken place was corre- 

 spondingly small. This would set up, at best, but a very 

 feeble current, which could in no way balance the volume of 

 water absorbed by an uninjured root system. Under such 

 conditions, a high turgor might be expected to have existed in 

 the new wood and cambium cells in the trunk and branches. 

 After the storm the available supply of assimilatory products 

 could not have been very great, and with little material and a 

 high internal tension, it would seem that cells of unusual form, 

 if not unusual size also, might have been formed by the cam- 

 bium. In other words the conditions seemed favorable for 

 the development of an oedematous wood. That such did 

 actually happen was plainly evident in a number of trees. 

 These were such as were deprived of most of their branches, 

 and on which but few buds developed. A large maple tree in 

 the eastern part of Lafayette Park may serve as an example. 

 This tree died during the summer of 1896 presumably, for it 

 failed to grow any in 1897 and was cut down in June, 1897. 

 The normal wood of the maple consists of wood fibers of small 

 lumen, arranged in exact radial rows, with an occasional large 

 vessel. (PI. VI. fig. 1.) The fall wood is marked by several 

 rows of cells, flattened radially. In this maple the outer ring to 

 the unaided eye looked watery and very pulpy. A portion of the 

 bark had been removed from the eastern side by flying mis- 

 siles during the storm. In June a small crown of leaves was 

 formed but it was evident in September that there was little 

 hope of saving the tree. Examined microscopically this pulpy 

 outer ring appeared like the fig. 2, PI. VI., which shows the 

 inner part of this ring together with the fall wood of the pre- 

 ceding year. The appearances might be explained as follows. 



