The article attempts to evaluate the biology course based on efforts made by the authors to introduce and collate data from such assessments made by Science Four classes of the Yakima High School in Yakima, Washington. The basic questions for evaluation were, whether certain units were definitely popular or unpopular or liked equally, whether there was a significant difference between the reaction of boys and girls, whether there was a significant difference between the reactions of able students and of poorer students, whether there was difference between the reactions of classes of the two teachers, and suggested changes in the course. Findings show that the units on Conservation and Paleontology were more popular among all students, more so among boys than girls. Boys' likes and dislikes are more marked than those of girls for the same age group. There are no significant differences between the reactions of abler students and of poorer students as both groups tend to like the units which they consider important rather than the ones which are easiest. Boys either have narrower interests in the biological field or feel more strongly about various subject matter fields than do girls. More boys are interested, some of them keenly so, in topics having to do with the outdoors like agricultural conservation methods, material about game birds and animals, and information regarding insect pests, weeds, and rusts.