Larix from Interglacial of Manitoba.—Penhallow. 369 
: J ) 
soda was readily cut by a microtome. The structure was found 
to be almost wholly intact and the effects of compression slight, 
‘ so that there was no difficulty in determining its characteristics. 
The second was more fully impregnated with silica, so that some- 
what prolonged treatment with carbonate of soda was necessary. 
Even then, there were localized siliceous bodies which offered 
some obstruction to the action of the knife. The structure was 
found to be fairly well preserved, and there was little change re- 
sulting from compression and distortion. The most marked gen- 
eral change in this, as in the first, was in the very strong develop- 
ment of striation on the cell walls. Little difficulty was ex- 
perienced in determining the various structural characteristics, 
though there were numerous localized areas of decay and siliceous 
deposit where the structure: had pretty completely disappeared. 
This was notably the case in the medullary rays, which, upon ex- 
posure in tangential section often showed complete obliteration of 
structure, indicating that the progress of alteration first proceeded 
along the course of these structures, while it was also noticed 
that fungus hyphez penetrated first into the tracheids, following 
the course of their longitudinal or major axes, thence spreading 
laterally through the bordered pits. 
The specimen received from Mr. Elliott was obtained by Mr.. 
R. Brown when digging a well in Section 23, Township 3, Range 
11, Manitoba. He recovered it from adepth of twenty-eight feet. 
In a letter from Mr. Elliott, he informs me that the surface soil 
was of about the usual depth of three feet of black, vegetable 
mould, beneath which, light blue lacustrine clay extended to 
where the wood was found. From data kindly supplied by Mr. 
VYyrrell the locality appears to be about three miles northeast of 
Pilot Mound, about seventy miles west of the Red river, and 
seventeen miles from the international boundary line. It is at an 
elevation of about 1,550 feet above sea level, and from 600-800 
feet above the general level of the Red River valley on the Pem- 
bina mountains or second prairie steppe. The formation in that 
vicinity is level and apparently alluvial. As, from the informa- 
tion at hand, it seems likely that the boulder clays were not 
reached, the formation is probably to be regarded as post-glacial. 
The specimen sent by Mr. Tyrrell was obtained from a well at 
Churehbridge, on the line of the Manitoba and Northwestern rail- 
way at a depth of two hundred feet. From the information so 
