The reason why Johanna may be regarded as the most valuable specimen for study is the fact that she is the only female of her race that has ever, in captivity, reached the state of puberty. She has done so, and this fact enables us to determine certain things which have never heretofore been known. This affords the zoologists an opportunity for the study of her sexual developments which may not again present itself in many years to come. From this important point of view she presents the student with many new problems in that branch of science. I have elsewhere stated my opinion that the female chimpanzee reaches the age of puberty at seven to nine years, and I have many reasons which I will not here recount that cause me to adhere to that belief. But the uncertainty of the age of this ape does not destroy her value as a subject of scientific study. The most sagacious specimen of the race that I have been brought in contact with is Consul II, who is now an inmate of the Bellevue Garden in Manchester, England. He has not been educated to perform mere tricks to gratify the visitor, in the way that animals are usually trained, but most of the feats that he performs are prompted by his own desire and for his own pleasure. There is a vast difference in the motives that prompt animals in the execution of these feats. I have elsewhere mentioned the fact that animals that are caused to act from fear do so mechanically, and the acts are not a true index to their intellect. While Consul and a few other apes that I have seen do many things by imitation, they do not do them by coercion. They seem to understand the purpose and foresee the result, and these impel them to act. Some of the feats performed by this ape I have never seen attempted by any other. One accomplishment is the riding of a tricycle. He knows the machine by the name of “bike,” although it is not really a bicycle. He can adjust it and mount it with the skill of an acrobat. The ease and grace with which he rides are sufficient to provoke the envy of any boy in England. He propels it with great skill and steers it with the accuracy of an expert. He guides it around angles and obstacles with absolute precision. He is allowed to go at liberty a great deal of his time; and this is the proper way to treat these apes in captivity. He rides the wheel for his own diversion. He does not do it to gratify strangers or to “show off.” [Illustration: CONSUL II RIDING A TRICYCLE (From a Photograph.)]