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The article focuses on the extinction of mule. Under the impact of mechanization, this animal has been steadily disappearing from agriculture, industry and transportation. Mule-breeding statistics around the world are not readily accessible, but the following figures for the U.S. are indicative. Mules have played an important role in human affairs over much of the world for a considerable period, and they deserve a fate better than such an obscure drift toward oblivion.

Provides information on cryptozoa, a multitude of small invertebrate animals concealed at the surface of the ground, dwelling in conditions of maximum security. Components of the environment where cryptozoa live; Analysis of the chief classes of the five phyla that are represented; Governing factor in the behavior and general biology of cryptozoa.

The article features the characteristics of the false scorpion of the species Chelifer cancroides. False scorpions are harmless relatives of the true scorpions. These animals are characterized with their rapid retreat. Another unique aspects of false scorpions is the complete consumption of its food, they do not require regular meals and they are indifferent to semistarvation.

The article presents a discussion about a certain insect with eight legs but is not considered to be a spider. These insects have elongated limbs that also serve as their sensory organs. The French call them les faucheux, which means "the reapers." The Germans call these insects die Afterspinnen, which means "near spiders," and the Americans call them daddy longlegs.

The article focuses on the different forms of spider webs. According to the article, different types of spiders have varying forms of spider webs to adapt to different environments. The webs spun by those spiders that hold to the rocks and tree trunks have the tendency to head down the slope, thereby, spreading the thread downward over an increasing area producing a web like that of Amaurobius or Agelenopsis. Other types of spiders like the Linyphiidae make webs of such fine silk that they are visible only in the morning when beads of dew trace their lines.