. The Canadian field-naturalist. 1974 Notes 79 formalin until turgid, and left in the solution for a period of 90 days. One week prior to termination of the fixation period, the hardened lenses were removed and cleaned. The lenses were then put into stoppered 3-dram shell vials containing 10% formalin until termination of the treatment. At 90 days, all lenses were removed, hand-dried with tissues, and immediately weighed to the nearest mg on a Mettler analytical balance to offset desiccation effects. Any discolored and damaged (because of handling) lenses were discarded. Results A differen
. The Canadian field-naturalist. 1974 Notes 79 formalin until turgid, and left in the solution for a period of 90 days. One week prior to termination of the fixation period, the hardened lenses were removed and cleaned. The lenses were then put into stoppered 3-dram shell vials containing 10% formalin until termination of the treatment. At 90 days, all lenses were removed, hand-dried with tissues, and immediately weighed to the nearest mg on a Mettler analytical balance to offset desiccation effects. Any discolored and damaged (because of handling) lenses were discarded. Results A difference in the weights of the right and left lenses was found for individual deer but neither lens was significantly heavier than the other. The right lens was heavier in 50% of the males and 49% of the females sampled. The left lens, on the other hand, was heavier in 43% of the males and 51 % of the females sampled. Of the total sample, only 6% of the animals had paired lenses of equal weight. The mean weights of the right and left lenses did not differ significantly for deer of the same sex and age class (P > ). Similarly, the mean lens weights for deer of the same age group but opposite sex were not significantly different (P > ). But the mean weights of the lenses for S '-2 LU 44 31 14 12 J (0 Y=-lll 55+ 82X^+ 109 29 x''' 2^2 4\ 6^2 Q^ 10^2 12/2 AGE OF DEER BY AGE-CLASS BASED ON CEMENTUM ANNULI Figure 1. Growth curve for the eye lens of black- tailed deer on Vancouver Island, British Columbia. Horizontal lines represent the range of the lens weights for each age class about the mean lens weight (circled). The small rectangles represent the 95% confidence intervals about the circled means. The small numbers above the curve represent the sample sizes within each age class. consecutive age classes were significantly dif- ferent and described a curvilinear relationship with age (Figure 1). The data were subsequently fitted to common lo
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