Note- Taking and the Use of Maps, Etc.—Foerste. 233 
some distance from rocks designated by another letter. It 
has been found convenient to designate any connected series 
of specimens from the same locality by the same letter, as for 
instance in case of a series of specimens showing the effects of 
contact metamorphism induced by some dyke upon the coun- 
try rock. The individual specimens collected are then desig- 
nated by the distance at which they are from the contact line. 
Any further record desired had best be written out upon the 
label. But where many sections are examined and several 
series along the same dyke are collected I have found it con- 
venient to place on the label after the number designating the 
distance from the contact line the direction in which the sec- 
tion from which the series of specimens were collected, ran 
and placing a line above the number expressing distance, if 
they were collected before such contact line w^as reached pass- 
ing in that direction and a line below that number if collected 
after the contact line had been passed. Thus, B. f. "^ 4, would 
indicate that the locality indicated by a certain note or label, 
was number 4 on a certain subsidiary map marked ~ in the 
note book and which was used to supplement that portion of 
the map covered by the letter ~ on the square B. f. on the 
original sheet. A. b. 36, d. U" (N38W), would indicate that 
the locality thus indicated was at the place marked 36 on the 
square A. b. of the original map. For further designation it 
is necessary to refer to the note book where under the note 
marked A. b. 36, and in the text of the same a letter d. is found 
in brackets at the beginning of a description in the field of a 
contact perhaps between a granite intrusion and a sedimentary 
sandstone. The figure 14" after this letter on the label accom- 
panying the specimen collected shows that it was found four- 
teen inches from the contact, the direction of the section is indi- 
cated later to have been made in a N. 38 W. direction and the 
line under 14" indicates that the specimen was collected 
before said contact line was reached, namely on the S. E. side 
of the contact line. 
When fossils are collected in new places where the horizons 
have not been carefully established collectors should not fail 
to designate the exact hight in the series at which any speci- 
men may have been secured, if time for such accurate labeling 
can be found. Although the mingling of fossils from different 
horizons at some one locality while distinct elsewhere, is not 
