The book documents a scientific expedition to observe avian life in a specific European region. The authors, H. Kirke Swann and an unnamed companion, embark on a journey to the Dobrogea and the Danube Delta, regions known for their rich biodiversity. The text details their experiences and findings, culminating in a systematic list of the birds encountered during their travels, providing a valuable record for ornithologists and naturalists.

This work is likely regarded as a significant contribution to ornithological literature, particularly for its detailed record of bird species in the Lower Danube region during the period of its original publication. The systematic list serves as a valuable data point for historical ecological studies and comparative ornithology. Its reception would primarily be among specialists in avian studies, natural history enthusiasts, and those interested in the travelogues of scientific expeditions.