Final answer:
The second international congress on education of the deaf is known as the Milan Conference of 1880, which had a significant influence on the education methods for deaf students.
Step-by-step explanation:
The second international congress on education of the deaf, which is a historic event pertaining to deaf education, was known as the Milan Conference of 1880. This conference had a significant impact as it endorsed the use of oral education over sign language for deaf students, a method represented by figures like Dr. Gallaudet.
Dr. Thomas Hopkins Gallaudet was a pioneer in deaf education, whose approach embraced sign language, as exemplified by the bronze memorial statue depicting him teaching Alice Cogswell the letter 'a' through sign language. The Milan Conference's decision was controversial and had long-standing implications for deaf education and the use of sign language.